Lamp-fixture.



W. E. COCHRAN.

LAMP FIXTURE. APPLICATION FILED JULY I9. 19%8.

' Patented Apl 22, 1919 WESLEY E. GOCHRAN, 0F CLEVELAND, OHIO.

LAMP-FIXTURE.

Specification of Letters Patent.

Patented Apr. 22, 1919.

Application filed July 19, 1918. Serial No. 245,593.

To all whom it may concern:

Be itknown that I, WESLEY E. (Doorman, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Lamp-Fixtures,

- of which the following is a specification.

My invention relates to improvements in lamp fixtures, and more particularly to imreadily connected to and interchangeable with the various parts of standard or conventional form now in common use in this class of fixtures.

With the above mentioned and other ends in view the invention consists in the novel construction, arrangement, and combination of parts, hereinafter described, illustrated in some of its embodiments in the accompanying drawings, and particularly pointed out in the appended claims.

Referrlng now to the drawlngs, forming a part of this specification, Figure 1, is a side elevation of a fixture embodying an improved interchangeable socket and shade holder, constructed in accordance with this invention, and shown in connection with a metallic'reflector of the pendant type.

Fig. 2, an enlarged view, partly in central section, partly in side elevation, of the improved interchangeable socket and shade holder.

Fig. 3, a side elevation of the same in connection with a modified form of metallic reflector.

Fig. 4, a similar view of the same in connection with a pendant ornamental glass shade, the latter being suspended by a pendantmember'in a form of a shade holder used in lieu of the pendant metallic reflector.

Fig. 5, an enlarged central sectional view of the improved socket and shade holder, the insulating base and sleeve ring being shown in side elevation.

Fig. 6, a cross sectional View of the interchangeable socket and shade holder taken on line'66, of Fig. 2.

Fig. 7, an enlarged fragmentary sectional view of the improved interchangeable socket.

Similar numerals of reference designate like parts throughout all the figures of the drawings.

The improved fixture embodies an improved interchangeable lamp socket and shade holder comprising an insulating base or block 1, provided with a socket opening or chamber 1, and carrying a screw shell 2, arranged within the socket opening 1, and spaced from the walls thereof and secured to the insulating base, in the present instance, by means of screws 2. The screw shell is provided with interior and exteriorrthreads forming a double screw socket shell or ring member, the interior of which is adapted to receive a threaded lamp base and the exterior of which is adapted to receive an interiorly threaded insulating sleeve or ring 8. The insulating sleeeve 3, extends between the screw shell 2, and the outer walls of the socket opening 1 of the insulating base, and is provided with an outwardly extending flange 3, extending beneath and arranged in cooperative relation to the lower edges of the insulating block or base 1, for attaching the lamp socket to an adjacent part or memher 4:, such for example as a metallic reflector 4, shown in Figs. 1, 2, and 3, of the drawings, or a shade holder 4, as shown in Figs. 4 and 5. of the drawings, said shade holder l, in the present instance, being in the specific form of a flanged ring provided with clamping screws 4, adapted to engage the upper edge of an ornamental shade 5.

The insulating base 1, and sleeve or ring 3, are preferably formed of porcelain and the adjacent part or member to which the lamp socket is attached is provided with an opening, such for example as the opening 4, of the reflector 4:, or the opening 4 of the shade holder 4*, to receive and contain the sleeve portion of the ring 3, and, if desired, a gasket 6, may be interposed between the parts, as shown in the drawings.

As a. means of detachably connecting a socket cover or casing 7, to the insulating block 1, and particularly as a means of interlocking the socket cover 7, in engagement with the insulating base and causing the cover 7, to be advanced toward the connected members, such as the perforated shade holder member 4", or the reflector 4, for clamping the latter, the sides of the insulating base or block 1, are provided with a pair of oppositely extending bayonet grooves 1 extending downwardly and curved laterally toward the base of the insulating block and the flanged portion of the insulating ring 3, the socket cover 7, being provided with oppositely located projections, in the present instance, in the specific form of inwardly extending studs 7, (see Fig. 6) adapted to enter the grooves or recesses 1 and interlock with the latter in a well known manner, it being obvious that upon the circumferential movement of the socket cover 7, the studs 7*, in engagement with the inclined portions of the grooves will cause the socket cover 7, to advance toward the reflector 4, or the shade holder 4, as the case may be, and thus effec tively clamp the parts in assembled and en gaged position.

The socket cover or casing 7, may of course be of any suitable and convenient form and, in the present instance, is provided with a cap portion 7*, and a nipple 7, for con venient attachment to an adjacent fixture art.

From the foregoing description, taken in connection with the accompanying drawings,

the operation and advantages of my inven tion will be readily understood.

Having thus described some of the embodiments of my invention, without having at tempted to set forth all the forms in which it may be made, or all the modes of its use, what I claim and desire to secure by Letters Patent, is,

1. In a lamp fixture, an insulating base having laterally inclined bayonet grooves and a screw socket-shell, a threaded insulating ring thereon, and a socket cover having projections in engagement with and advanced by said grooves in clamping relation toward said ring when. moved circumferentially.

2. In a lamp fixture, an insulating base having curved bayonet grooves and a threaded socket, a threaded insulating sleeve therein in clamping relation to said base, and a socket cover having projections in and advanced by said grooves toward and in clamping relation to said sleeve as moved circumferentially.

3. A lamp fixture, comprising an insulating base carrying an interiorly and exteriorly threaded socket ring member, a flanged insulating sleeve threaded thereon, a member having an opening receiving said flanged insulating sleeve and clamped between the latter and said insulating base, and a cap cover removably mounted on and interlocking with said insulating base and clamped against said member, said interlocking means between said cap cover and base comprising a bayonet joint.

5. An interchangeable lamp socket and shade holder, comprisingan insulating base having curved bayonet grooves and carrying a socket screw shell, an insulating sleeve threaded outside of the latter and having an annular shoulder extending in cooperative clamping relation to said insulating base, and a socket cover having projections in engagement with said curved bayonet grooves and advanced by the latter toward and in clamping relation to said annular shoulder of said sleeve when moved circumferentially.

6. An interchangeable lamp socket and shade holder, comprising an insulating base carrying a socket screw shell, an insulating sleeve threaded thereon and provided with an outwardly extending-flange, a member having an opening taking over said sleeve and engaged and clamped by said flange against said insulating base, and a socket cover surrounding and interlocking with said base and constructed and arranged to-be advanced and clamped against said member.

7. An interchangeable lamp socket, comprising an insulating base having a socket opening and a double screw socket shell within and spaced from the walls of the latter, an insulating sleeve threaded on said screw socket-shell and extending between the latter and the walls of said socket opening, said sleeve having an annular flange extending beneath the lower edges'of said i11- sulating base, and a socket cover removably interlocked with said insulating base and constructed to be advanced in cooperative clamping relation toward said annular flange and the lower edges of said insulating base.

8. A lamp fixture, comprising an insulating block having peripheral laterally curved bayonet grooves and a socket portion, a threaded shell in the latter and spaced from the walls thereof, a clamping ring threaded in engagement with said threaded shell and insulating block, a perforated shade-holder member interposed between the latter and said clamping ring, and a socket cover having internal projections interlocking with said laterally curved bayonet grooves and advanced by the latter when moved circumferentially into clamping engagement with said perforated member. v

9. A lamp fixture, comprising a cylindri cal insulating base having peripheral oppositely arranged curved bayonet grooves and a socket chamber, a threaded sleeve member in and spaced from the latter forming an intervening annular space therein, a threaded clamping ring on said threaded sleeve member and within said annular space, a relatively fixed member carried by said clamping ring, and a socket cover surrounding said cylindrical insulating base and having internal projections interlocking with and advanced on said curved bayonet grooves toward said relatively fixed member when moved circumferentially.

10. In an interchangeable lamp socket and shade holder, an insulating base having curved bayonet grooves and provided with a threaded socket, and a socket cover having projections in engagement with said curved bayonet grooves and advanced by the latter toward and in clamping relation to said base as moved circumferentially.

11. In a lamp fixture, an insulating base having oppositely arranged laterally extending bayonet grooves and provided with a threaded socket and a flanged head, and a socket cover having projections in engagement with said laterally extending bayonet grooves and advanced by the latter in clamping relation to said flanged head as moved circumferentially.

12. In an interchangeable lamp socket and shade holder, an insulating base having laterally inclined grooves and a threaded socket, said base being provided with an outwardly extending annular flange, a member carried by said annular flange and provided with an opening registering with said threaded socket, and a socket cover having projections in and advanced by said grooves toward and in clamping relation to said member and outwardly extending flange as moved circumferentially.

13. In a lamp fixture, an insulating base having laterally inclined members and a threaded socket and provided with an outwardly projecting annular flange, a relatively fixed member carried by said annular flange and provided with an opening registering with said threaded socket, and a cap socket cover interlocking with and advanced by said members toward said member and outwardly projecting flange as moved cir cumferentially.

14. In an interchangeable lamp socket and shade holder, an insulating base having peripheral laterally curved bayonet grooves and a threaded socket portion, said base having an annular flange at one end, a member carried by said flange having an opening registering with said socket portion, and a cap socket cover having internal projections interlocking with said laterally curved bayonet grooves and advanced by the latter when moved circumferentially in clamping relation to said member supported on said annular flange.

15. An interchangeable lamp socket and shade holder, comprising a cylindrical insulating base having peripheral oppositely arranged curved bayonet grooves and a threaded socket chamber, said insulating base having an annular flange extending from one end and surrounding said socket chamber, a relatively fixed member carried by said annular flange, and a socket cover surrounding said cylindrical insulating base and having internal projections interlocking with and advanced on said curved bayonet grooves toward said relatively fixed member and flange in clamping relation thereto when moved circumferentially.

In testimony whereof I have aflixed my signature in the presence of two witnesses.

WESLEY E. COC-HRAN.

Witnesses:

W. G. Graves, O. C. BILLMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

